Getting "email must be email" error when using apiService.initializeSession

Hi i'm using the ApiService from

@novu/client

@novu/client

package. The code is somewhat like:

import { ApiService } from "@novu/client"
const api = new ApiService("http://...")
await api.initializeSession(subscriberId, appId)

import { ApiService } from "@novu/client"
const api = new ApiService("http://...")
await api.initializeSession(subscriberId, appId)

And I keep getting the error "email must be an email" even though there is no parameter for email in the method interface.